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r � <br /> 4 <br /> • <br /> Wendy L. Cohen -2- 14 January 1997 <br /> The full lateral and vertical extent of soil contamination needs to be better defined. It has been over <br /> eight years since the soil was sampled, so baseline concentrations should once again be determined <br /> prior to implementing remedial measures. The western parcel should also be addressed. Soil <br /> sampling should include leachability testing to determine the threat that soils pose to groundwater. <br /> Groundwater should be sampled quarterly and analyzed for TPH as gasoline, diesel and motor oil <br /> (EPA Method 8015M with silica gel cleanup), PNAs (EPA Method 8310), aromatic compounds and <br /> methyl t-butyl ether(EPA Method 8020), and lead (EPA Method 239.2). After three consecutive <br /> quarters of groundwater monitoring,we should determine the need for additional monitoring wells. <br /> I foresee needing at least three additional wells. <br /> The "lost"monitoring wells should be found and either refurbished or properly abandoned. The <br /> existing wells that were recently sampled after seven years should be redeveloped. <br /> JMW:jmw/lsb <br />